Hello,
Thank you for your question.
As someone who has visited this site as a non-member before recently deciding to join, I find that the answer to your question varies as greatly as the the people who choose to visit this site.
For one person, a small change in their personal life, such as someone taking a genuine interest in them, either in this forum or in real life, could make the difference between that person choosing to CTB or keep living (for the present, or even for the rest of their natural lives).
Factors such as years of abuse, familial strife, mental illness, physical ailments, economic difficulties, or even just the simple trauma of watching the world's decline afflict many people here and motivate suicidal ideation, and simply venting, knowing that others here share similar pains, can be highly cathartic, possibly extending that person's life for a meaningful time or until it's natural end.
And yet another, living within the scope of their own problems while seeing those of the wider world, may see this life as simply not being worth the effort. They also may continue for a time, knowing that the changes they wish to see aren't going to occur under human society's persisting conditions. But the fact that this site exists is, in itself, evidence that someone understands. And understanding, with or without CTB, is always helpful.